Air-brake system.



r. E. SCHAL'LOCK. MR BRAKE SYSTEM.

APPLIQATIOI FILED API.25, I917- 1,250,361; mm Dec. 18,1917.

FBEDRICK SCHALLOCK, OF SAN FRANCISCO, CALIFORNIA.

AIR-BRAKE SYSTEM.

Specification of Letters Patent. I

Patented Dec. 18, 191 '7.

Application filed April 25, 1917. Serial No. 164,531.

.To all whom it may concern;

Be it known that I, FREoaroK E. Sonar.- wCK, a citizen of the UnitedStates, residing It San Francisco, in the county of San Fran cisco,State of California, have invented certain new and useful Improvementsin Air: Brake Systems; and I do hereby declare the following to be afull, clear, and exact de scription of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

This invention relates to an air brake system and is particularlyadapted for use on heavy vehicles such as motor trucks.

An object of the invention is to so construct the device that it may beincorporated in a truck and attached to the ordinary band brake.

A further object of the invention is to provide for the compression ofair by the rive wheel of an engine, the compression being under thedirect control of the operstar.

. Liurther object of the invention is to so construct the device that itmay be readily incorporated in vehicles of the types used at the presentday, and its installation therein will he exceedingly simple and may bey do a g icklflaccomplished. t

Wi thesetand other objects in view, such as will up or as thedescription progresses, my invention comprises the combination andarrangement of parts as set forth in and falling within the scope of theappended thebrake' applying cylinder.

Fig. 4 is a similar view of the pumping mechanism.

, Fig. is a similar view of the controlling valve showing its positionon the steering rod casing.

Fig. 6 is asectional view of the controlliiig valve.

Fig. 7 is a. detail perspective view of the- "foot pedal and itsconnection with the shifter lever.

Referring to the drawing wherein like parts are indicated by likecharacters throughout the several views The reference character 1indicates the chassis of a motor truck and 2 the rear axle thereof onwhich are mounted brake drums3 having the ordinary band-brakes -lthereon,

'It'is for the application of this hand brake to retard or completelystop the rotation of the rear axle 2 that my invention is designed, andin order that this brake ma be effectively controlled, I have mounte "onconnected at its upper end to a three-way valve 12, the latter beingcontrolled manually by a handle 13.

(onnected to this valve 12 and extending downwardly Within the'casing 11of the steering: post is a pipe 14 which is connected at its other .endto an air storage tank in which air under pressure is, retained. It willthus be seen that when the valve '12 is operated by the handle 13 toallow com- 5 and thus more the P13 mnnication between the pipes 9 and 14that air will be forced through the pipe 9 from the storage tank 15 andwill move the piston 6 'so that the hand brake 4 will be applied to thedrum 3 to frictionally engage the'same and retard or prevent therotation of'the rear" axle 2. has of course to be understood that thevalve 12 may be so 0 erated that communication between t o pipes 9 and14 will be shut off 'and this position is illustrated in Fig. 6 ofthedrawin In order that air may be compressed in t e storage tank 15 at thewill of the operator-,1

have mounted on the chassis a cylinder1 6 in which is operable a piston1'2, and which -'cylinder 16 is connectedto the storagetank 15.by asuitable pi e 18. Thispiston 17 is connected to an ec ntric disk 19 byarod-QO,

which-disk is mounted on a shaft 21, the lat ter being rotatably mountedin suitable bearings supported by the chassis. On the other end of thisshaft 21 is" a sprocket 22 over which a chain 23passes and by means ofwhich chain the sprocket22 is rotated and handle 13 toallowcommunication between f consequently the'piston 17 reciprocated inthe p1pes9 and 14 at which time air is mthe cylinder 16 to compress theair in the jected into the cylinder and the brakes 4 storag: tank 15,this chain 23 passes over-a ap lied. 6 sproc et 24 mounted fixedly on ashaft 25. I

' i .'reganlily seen that 'I ave provided an ex-j In order that thissprocket 24 may-be driven at the, will of the operator, I have 1 gmounted on theshaft 25 a friction wheel'2 the periphery of which wheelengages the rear face of the drive wheel 27 of the engine,

but which wheelnormally rotates independently of the shaft 25, however,in order that this friction wheel 26may be clutched-to the sprocket 24,'I have provided a suitable,

1'6 clutch member 28'on the sprocket 24, and a said wheel may beclutched to the sprocket and because of its frictional engagement withthe drive wheel 27 rotates the said p I I particular embodiment as it isobvious h t sprocket and actuates the piston 17. In order that the wheelmay be clutched to-the sprocket 24, I have provided a shipper lever 3Qwhich is 'operatively connected with a I pedal .31 Within reach of theoperator. This 26 wheel ;26' is normally held out of cooperativerelation with the sprocket 24 bya spring 32 connected to the pedal 31.

Extending from the three-Way .valve 12 isan exhaust pipe 33 betweenwhich pipe 'communication may be had through the said valve 12 so thatwhen it is desired "to allow the air-to escape from the cylinder 5 torelease the brakes, the valve 12 may be so 5 turned as to -allowcommunication between 85 the'pipes '9 and 33 and thus the air will beexhausted from the cylinder 5 and the "brakes released. j

I The storage tank 15 is provided with'a gage 35 within the observationof the opera- .to:-.

air stored in the tank 15, at this time the pipeagi) and 33am incommunication and the 4'- cl d; When the pressure indi (in-this gage 35reaches the desired tthe pedal 31 is released and while the v .-wheel 26continues its rotation, the

action-is stoppedbecauseofthediseng'agemeritxof the cl utjch members 28and 29 1 caused. bythe'sp m ezz When it is desired sfioapPlyth brakesthe'operator moves the clutch member 29 on the wheel 26 so that thestorage tank, means 'for controlling the in- -.-fdisk,a I In operationthe pedal 31 is ushed down Hanna. said friction wheel and the; said romthe .foregoin description it will be ceed-in'gl simple and eflicient airbrake sysi tem par icularly adapted for use in motor trucks, and I haveso Iwnstructedthe device that air pressure may be maintained at an evenoint 'atthe W111 oi the p a I havelirther provided a devic w i may beincorporated in anyof the resent day trugks and connected to the banbrakes now use a WhileI have illustrated and described aparticularnembodiment oi my invention, 1' ave merely done so, for thesake'pf'convenience and I do not wish to be limited to that numerouschanges may be made in the details of constructi'on thereof without inany way departing'from the spirit oi the invention or without exceedingthe scope tithe appended claim a i at I claim is:

In combination with a motor truck h ving a hand brake on the rear axlethereof ia' cylinder, a piston operable in said cylinder and operativelyconnected to said band brake,- a

j ectionof air into the said cylinder from the storage tank, means forcompressing air, in the said storage tank comprising a cylinder, a pipeconnecting the cylinder to the storage tank, a piston operable in the clinden-and having" -a rod thereon, a dis rotatably mounted on thechassis ofthc truck, the said rod bein 'eccentrically connected to thesaid 'ction wheel mounted on-th'e-chassis and bear-in against thedrivewheel of a the. engine, a p urality of sprockets, a chain passing oversaid sprockets, the saidsprockets being constructed andarranged. tocondisk, means to clutch the said friction wheel to one of said srockets and "automatic means to render said clutching. meansinope'rative.

In testimony whereof, afiix my signature, 105 in the presence. oftwojwitnesses.

'1 Witnesses? WM. J; SOHALLO'OK, JOHN E. JOHNSON.

